| Hyperfocal distance | Using the depth of field principle, as a lens is gradually focused to farther subject distances, a point will eventually be reached where the far limit of the rear depth of field will be equivalent to \"infinity.\" The shooting distance at this point, i.e., the closest shooting distance at which \"infinity\" falls within the depth of field, is called the hyperfocal distance. The hyperfocal distance can be determined as follows:
Hyperfocal distance = f2 / (d • F)
f: focal length
F: F number
d: minimum circle of confusion diameter
Thus, by presetting the lens to the hyperfocal distance, the depth of field will extend from a distance equal to half the hyperfocal distance to infinity. This method is useful for presetting a large depth of field and taking snapshots without having to worry about adjusting the lens focus, especially when using a wide-angle lens. (For example, when the EF 24mm is set to f/11and the shooting distance is set to the hyperfocal distance of approximately 1.5m/4.9ft, all subjects within a range of approximately 70cm/2.3ft from the camera to infinity will be in focus.) |
